MSA PremAire System User manual

Combination
Breathing
Apparatus
and
LEAK TESTING
TAL 502 (L) Rev. 0 © MSA 2005 Prnt. Spec. 10000005389 (I) Mat. 10064381
Doc. 10064381

LEAK TESTING
SECOND STAGE
Leak Testing should be performed when the apparatus
fails any of the inspection steps; following disassembly;
or, as part of a regularly-scheduled maintenance proce-
dure. The apparatus must hold system pressure without
leaks to provide adequate protection. The component leak
test procedure is the first step in trouble-shooting. These
tests ensure that you do not have a leak. Leak testing
quickly identifies components which need repair or
replacement. Use P/N 600920 leak test solution, or pre-
pare a soapy water solution. Be sure to use enough soap
to produce bubbles.
Do not tighten fittings or connectors when the system
is pressurized. Close the source or cylinder valve. Be
sure nothing blocks the regulator outlet. Relieve pres-
sure from the system by slowly opening the bypass
valve. Failure to follow this precaution may cause fit-
tings or connectors to rupture, resulting in serious
personal injury or death.
SECOND STAGE REGULATOR
1. Grasp the mask-mount-
ed regulator and push
the shut-offbutton IN.
Note: Shut-off button may be stored IN.
2. Check that the red
bypass knob is fully
closed (clockwise).
3. Connect a pressurized air-supply to manifold inlet.
4.No air should flow form
the regulator. If it does,
repeat steps 1 and 2.
5. Check for bypass oper-
ation. Grasp the red
knob and turn it 1/4
turn (counter-clock-
wise) until it locks in.
Listen for air flow,then
turn it OFF. Close cylin-
der valve or air source
fully.
SECOND STAGE HOSE
Apply leak test solution to both hose end and fittings at
each joint. If bubbles appear, see Second Stage Hose
section.
MANIFOLD BLOCK
1. Apply leak-test solution to hose connections and
quick-disconnect fittings at the manifold inlet and the
manifold mask-mounted regulator outlet.
2. If bubbles appear at any of these joints, the leak must
be corrected. See repair instructions.
3. Crack the bypass valve slowly to bleed off pressure.
If the function or connection fails, do not use the
apparatus. The apparatus must be checked and cor-
rected for proper operation by an MSA trained or cer-
tified repairperson before using. Failure to follow this
precaution may result in serious personal injuryor
death.
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TAL 502 (L) Rev. 0 - 10064381

LEAK TESTING
EMERGENCY-ESCAPE CYLINDER FIRST-STAGE
REGULATOR
Note: Return the regulator to an MSA CARE Repair
Center where indicated for Disassembly and Repair.
1.Open the cylinder valve fully.
2. Apply leak test solution
to the first-stage regu-
lator cap. If bubbles
appear, Return to an
MSA CARE Repair
Center.
3. Apply leak test solution
to the connection
between the first-stage
regulator and the cylin-
der valve outlet. If bub-
bles appear, securely
tighten the regulator
coupling to the cylinder
valve outlet.
4. Apply leak test solution
across the vent holes in
the regulator body. If
bubbles appear. Return
to an MSA CARE
Repair Center.
5. Apply leak test solution
to the elbow and hose
joint, and the full length
of the hose to the man-
ifold. If bubbles appear,
see repair instructions.
EMERGENCY-ESCAPE CYLINDER VALVE
Close the emergency-escape cylinder valve. Be sure
nothing blocks the mask-mounted regulator outlet.
Depressurize the first-stage regulator and hose
assembly. Failure to follow this precaution may cause
fittings or connectors to rupture, resulting in serious
personal injury or death.
Outlet Port (coupling nut connection)
1. Be sure that the cylinder is FULL and the valve hand-
wheel is completely closed.
2. Draw a bubble of leak
test solution across the
valve outlet port. Use
your fingers to cover
the two bleed hoes on
the threads.
3. If the bubble expands, thereis an air leak through the
valve. Return to an MSA CARE Repair Center.
Pressure Gauge
1. Apply leak test solution
to the pressure-gauge
fitting. If bubbles
appear. Return to an
MSA Repair Center.
Cylinder Neck
1. Apply leak test solution
to the cylinder neck. If
bubbles appear,the
cylinder must be taken
out of service. Return
to an MSA Repair
Center.
3TAL 502 (L) Rev. 0 - 10064381

LEAK TESTING
Cylinder Handwheel and Safety Plug
1. Apply leak test solution
the cylinder handwheel
and safety plug. If bub-
bles occur at the cylin-
der handwheel or at the
safety plug. Return to
an MSA CARE Repair
Center.
After All Components are Leak Tested
1. Be sure the air source is completely closed.
2. All repair procedures assume that the air source
assembly is disconnected from the manifold.
3. Be sure that nothing blocks the regulator outlet. Open
the bypass valve to relieve pressure in the system.
4.Use a clean, lint-free cloth to wipe all components of
PremAire Respirator dry.
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TAL 502 (L) Rev. 0 - 10064381

COMBINATION BREATHING APPARATUS LEAK TESTING
Note: The cylinder must be disconnected from the appa-
ratus to perform this test.
Outlet Port
1. Ensure that the cylinder valve handwheel is completely
closed.
2. Draw a bubble of leak
test solution across the
outlet port.
3. If the bubble expands, there is an air leak through the
valve and the cylinder must be taken out of service.
PressureGauge
1. Remove the rubber gauge guard.
2. Apply leak-test solution to the pressuregauge stem,
cover, and bezel.
3. If a bubble appears, remove the cylinder from service.
The pressure gauge must be replaced.
Cylinder Neck
1. Apply leak-test solution to the cylinder neck.
2. If bubbles appear, remove the cylinder from service.
Cylinder Handwheel and Safety Plug
1. Apply leak-test solution
to the cylinder hand-
wheel and safety plug.
2. If bubbles appear, the remove the cylinder from ser-
vice. The valve must be repaired.
Leak-Testing the Complete Apparatus
1. Unscrew the regulator cap and remove the spring and
diaphragm. Also, remove the breathing tube from the
regulator.
2. Connect the coupling nut to the cylinder and tighten.
Open the cylinder valve.
3. Coupling Nut Leak-Test
a. Apply leak-test solu-
tion to the front and
back of the coupling
nut.
b. If bubbles appear, relieve pressure and further tight-
en the air coupling nut.
c. Re-apply leak-test solution.
d. Continuation of bubbles indicates a leak. Close the
cylinder valve, relieve the system pressure, and
remove the apparatus from service.
Regulator Body (High Pressure Regulator) Leak-Test
1. Apply leak-test solution to the pipe threads on the
other side of the coupling nut (the side that threads
into the regulator housing).
2. Apply leak-test solution
wherethe elbow
threads into the regula-
tor.
3. Apply leak-test solution around the joint at the top of
the regulator.
4. If leaks appear at any of these places, remove the reg-
ulator from service.
Hose Assembly Leak-Test
1. Apply leak-test solution to both hose end-fittings.
2. Apply leak test solution to all joints at the lateral pipe
fitting, check valve, elbows, and quick-disconnect
plugs.
3. If leaks appear at these places, remove the hose from
service.
5TAL 502 (L) Rev. 0 - 10064381

COMBINATION BREATHING APPARATUS LEAK TESTING
Regulator (Low Pressure) Admission Valve Leak-Test
1.Draw a bubble over the
regulator outlet. Place a
finger over the aspirator
holes. Do not depress
the lever arms.
2. The bubble must not expand or burst for at least 15
seconds. A leak indicates that the admission valve
must be replaced. Remove the regulator from service.
Air-Line Inlet Leak-Test (Quick-Disconnect Plug)
1. Apply leak-test solution
across the ends of the
quick-disconnect
plugs. If bubbles
appear, the quick-dis-
connect check valve is
leaking. Remove the
regulator from service.
Reassemble the regulator cap, spring and diaphragm
1. Check that the lever assembly is positioned correctly:
Small arm on top.
2. Hold the regulator cap and place the spring in the
hub. Place the diaphragm hub on top of the spring.
3. Press the diaphragm ring into the cap. Insert the
assembly and screw the cap into the regulator body
and hand-tighten.
Breathing Tube Leak-Test
1. Stretch the breathing tube 10-12 inches beyond its
normal length.
2. Connect the ends of the tube and thread hand-tight.
3. Slowly release the tension on the breathing tube. The
air inside the breathing tube will compress to about 3
psi.
4.Submerge the breathing tube in water. Bubbles will
indicate leaks. If the breathing tube leaks remove it
from service.
Regulator Diaphragm Leak-Test
1. Check that the diaphragm works properly. The regula-
tor outlet should be cleaned and disinfected before
and after testing.
2. Check that the cylinder valve is closed, the air-line
source disconnected, and that the unit is not pressur-
ized.
3. Gently inhale through the regulator outlet and hold
your breath for about 10 seconds. If a positive pres-
sure is maintained, there is no leakage.
4. Gently exhale through the regulator outlet for about 10
seconds. If a positive pressure is maintained, there is
no leakage.
5. Do not use the apparatus if air flow through the regu-
lator is detected in either test. Return the regulator to
aCARE Certified repair person.
6. Thread the breathing tube on the regulator. After all
components have been leak-tested, use a clean, lint-
free cloth to wipe the apparatus dry. Following leak-
testing, you should performthe apparatus Function
Test (see Inspection Procedures).
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TAL 502 (L) Rev. 0 - 10064381